Evil people do evil things.
If Jah uses satan for anything, it is only for one purpose, to filter out satan. The ability to be tempted to wickedness reveals who is God and who is men. God chooses Righteousness, men choose wickedness.
I haven't watched the godfather movies, but don't be fooled into thinking that the wicked do their wickedness to help anybody else except themselves. They only look for power and control.
I and I have been given the choice to trod with Jah, or not to trod with Jah. Jah made I and I to have knowledge so that we can make changes within us and outside of us. So we have the power to build or destroy. If I and I are trodding with Jah, then we will build what should be built and destroy what should be destroyed. Sometimes certain things need to be destroyed. For example, the food we eat is destroyed by our teeth and enzymes, and then rebuilt to fuel and repair our body. Jah will keep I and I in the right balance if we Live by the example of Jah. If we are trodding against Jah, then we will live with imbalance and not do our part in this Creation, but we will be working against Life.
As I have said, we have been given the ability to build and destroy. These abilities are not evil, but are there to promote Life. What is evil is when building and destroying get out of balance and work against Life, so things are built that shouldn't be built and things are destroyed that shouldn't be destroyed. Jah doesn't want I and I to only do good because we have no choice. Jah is developing a Perfect Creation that will choose righteousness, not because they were programmed to choose righteousness, but because they have risen up within themself and have chosen good over evil.
Jah knows all things and is not programmed by anyone, but can see and choose what Jah wants, and Jah always chooses to promote Life. Ye are Gods and all of ye are children of the Most High, but ye shall die like men, and fall like one of the princes. When I and I Live by the example of Jah, then I and I will be a Creation that Lives in the image of Jah, and are not programmed by anyone, but can see and choose what I and I want, and I and I will always choose to promote Life.
So evil comes only from one place, from within ourself, it is our choice to make.
12 Blessed is the man that endureth temptation: for when he is tried, he shall receive the crown of life, which the Lord hath promised to them that love him.
13 Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man:
14 But every man is tempted, when he is drawn away of his own lust, and enticed.
15 Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.
16 Do not err, my beloved brethren.
17 Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.
Root of Evil